Valve-grinder.



L. G'. MASSICOTTE 6L G. C, BUSWEU.,

VALVE GRINDER.

APPLICATION FILE-u APR. 2s. 191e. RENEwED xuNE n. 19u. 1,244,526.

Patented Oct. '30, 1917.

till

LOUIS G. Messicor'rn, or rnovrnnncn, riz-ione istanti, ann enonenc. noswntn," OF y immensen, CONNECTICUT, assis-Nens To rrr-:e 'rooL conrnnryon rnournnncn,

RHODE ISLAND, A CORPORATION or aHonn isLANIo. j

vaten-emanan.

Specification of Letters Patent.

retreated oct. so, i917.

, Application led April Z6, 1916, Serial No. 93,784. Renewed June 11, 1917. Serial No. 174,163.

are to provide a simple and convenient tool` for this purpose which can be converted from an ordinary screw-driver to a valve grinder of that type in which two prongs separated trom each other are arranged to engage in slots in the valve to be ground; also to provide a construction in which the distance apart of these prongs can be regulated readily, and especially to .provide an arrangement whereby the members carrying these prongs can be moved back out ci? the way, without danger of dislodging them from the shank, so asy to expose the screwdriver suiiiciently to permit it to be used in the ordinary way.

Reference is to be had to the accompanying drawings in which- Figure -1 is an elevation or a tool constructed in accordance with this invention, showing the parts in the position for grinding a valve;

Fig. 2 is an edge view showing the parts in the position shown in Fig. l;

Fig. 3 is a view similar to Fig. ishowing the parts drawn back so as to expose the screw-driver smciently for thatto be used, and

Fig. 4: is a side view of one of the jaws.

The tool is shown as comprising a single piece shank A having an oiset a, and a handle B at the end to facilitate rotation of the shank which is/provided with a fiattened end C constituting a screw-driver. The shank is provided with a pin c projecting from opposite sides thereof constituting pivots for a pair of jaw members D, These jaw members are provided with longitudinal slots d for the pins. They are also providedV each of them with a prong d 'and with a transverse slot d2.

Through a longitudinal slot a in the When it is desired to use the device as an ordinary screw-driver either for valve grinding or for any other purpose the thumb nut and 'bolt are loosened and the two jaws are moved straight back toward the handle, the slots being provided for permitting this motion to take place without disengaging the jaws or the bolti'rom the shank. This position of the parts is shown in Fig. 3.,

It will be noted that the prongs lie along the shank when retracted so as not to project outwardly and be in the way. v

This is an improvement over the devices known in the market for the reason that the two implements constitute a unitary device whichcan be used for both purposes without danger of becoming disengaged. Therefore the losing' of the jaws is prevented, and at the same time the adjustment is quick and easy and suiiiciently accurate for the purposes intended. Furthermore the members D are held inl position when drawn back as shown in Fig. 3 by tightening up the nut. In this way there are no parts likely to be lost and no complications introduced into the operation of valve grinding by the useV of this tool. 0n the contrary that operation is greatly facilitated and yet the tool can be manufactured and sold at a very small price.

Although gwe have illustrated and described only a sin le form of the invention we are aware of t e fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore we do not wish to be limited to a'll the details of construction herein shown and described, but what we do claim iszl. As an article of manufacture, a tool for grinding valves and the like comprising A a handle portion, a shank having an oiiset saidmembers being provided with a pro- Yje'cting prong.

2. As an article of manufacture, a tool .for grinding valves having a shank profrom each other, each member having a prong at the end adapted to extend beyond the end of the screw-driver, and means whereby said members can be drawn back on the end of the shank without disengaging them therefrom and clamped in their retracted position.

3. As an article of manufacture, a valve grinder comprising a shank provided with a pair of offset members thereon, each having a longitudinal slot at one end, and a transverse slot, each having a projection extending materially beyond said transverse slot, and meansy for securing said members to the shank through the transverse slots,

said shank having means for entering the longitudinal slots.

el. As an article of manufacture a valve grinder having a screwdriver shank, a pronged member thereon, and means for clamping said pronged member in two positions, in one of which'the pronged member projects beyond the end of the screw-driver and in the other of which it does not.

5. As an article of manufacture, a valve grinder comprising a shank havingl a double pin thereon and a bolt and nut, and

intese a pair of pronged members oneppesite side of said shank each having a longitudine slot for receiving said stud, and a transvensij slot for receiving said bolt, said shank having a longitudinal slot along which the boltv said slot, and two jaw members adjustable i therewith.

7. As an article of manufacture, a tool ci the character described comprising a shank having a longitudinal slot therethrough, a fastening device adjustable along said slot, two jaw members adjustable therewith, and means on the shank for guiding said jaw members.

8. As an article of manufacture, a tool of ject the prongs vof said members when they are advanced, and to move them back to a position along the shank when they are retracted.

ln testimony whereof we have hereunto set our hands.

LOUS G. MASSICGTTE. GEGRGE C. BOSWELL. 

